Thermostatic circuit controller



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PATENT QFFICE,

COREL A. STEWELL, 6F IONIA, MICHIGAN.

THERMOSTATIG CIRCUIT CQNTBOLLEB.

Application filed may 8,

. This invention relates generally to alarms and has more specific reference to new and useful improvements in thermostatically controlled fire alarms.

The primary object of the present invention is to provide such an alarm so constructed and arranged that upon a fire breaking out in any room or place where it is in-' stalled, it will sound an alarm indicating that a certain degree of temperature has been reached.

Another object of the present invention is the provision of such an alarm having in-- corporated therewith new and novel means for adjusting the same so that it may be regulated to operate at difierent temperatures.

A further object of the present invention is -to provide such an alarm including a hanger, a novel frame hingedly carried by the hanger and a thermostat carried by the frame and which when subjected to heat, will expand so as'to rock the frame about its pivot to close a circuit through a suitable signal such as a bell, lamp or enunciator.

A still further object of the present invention is to provide an alarm of the above character which is durable and efficient in use, one which is easy and cheap to manufacture and one which is well designed for thepurpos'es for which it is intended.

Withthese and numerous other objects in view, the invention resides in the novel construction, combination and arrangement of parts as will be more fully hereinafter described, illustrated in the accompanying drawings and particularly pointed out in theaplplelanded claims.

accompanymg drawings wherein for thethe drawings forming a part of this application and wherein like characters of reference'have been employed'to designate corresponding parts throughout the several views:

Figure 1 is a front viw of a fire alarm constructed in accordancewith the present invention. 7

Figure2 is a vertical central sectional view through the same taken on line 2-2 of Figure 1.

Figure 3 is a side view thereof. 4

Figure 4 is a top plan view of the improved alarm. 7

Figure 5 is a sectional view taken on line 5-5 of Figure 1.

Referring ,now more particularly to the 1926. Serial No. 107,732.

purpose of illustration has been disclosed a preferred embodiment of the present inven tion, the letter A generally indicates a hanger upon which is hingedly mounted the frame B carrying the thermostat C of any conventional or preferred construction, and which, when subjected to heat of a predetermined degree will operate to close an electric circuit for sounding a suitable signal as will be more clearly hereinafter set forth.

The hanger A comprises an elongated supporting plate 10 having an aperture 11 at the upper end thereof so that the same may be readliy suspended from a suitable nail, hook or the like. Carried by and extending forwardl from the plate 10 adjacent the lower en thereof is the horizontal supporting rod 12 upon which is hingedly mounted the novel frame B.

The frame B embodies in its construction the two independent side sections 13 and 14 of identical formation and including the upper spaced parallel vertical arms 15 and 16 and the lower converging legs 17 and 18, the terminals 19 and 20 of the said legs being 'angularly directed and disposed in spaced parallel relation relative to one another.

' Arranged to be supported by and between the terminals 19 and 20 of the said legs is the thermostat C and while this thermostat may be of any conventional or preferred construction, the type disclosed herein includes generally a pair of vertically positioned heat expansible wafers 21 and 22, to the axial cen-= ters of which are secured the supporting trunnions 23 and 24 which pass through the said terminals and are secured therein by means of suitable nuts 25.

The independent frame sections 13 and 14 are bent intermediate their ends to-provide substantially U -Shaped formations as will be clearly seen upon reference to Fi e l and riveted or otherwise secured to t e vertical portions 26 of the said intermediate U-shaped formations are the hinges 27 and 28, the said hinge 27 being provided with the inwardly directed spaced ears 29 and 30 while the hinge 28 is provided with the inwardly disupporting rod 12 serves to retain the hinges at a predetermined distance from the plate 10 while a suitable nut 34 engaging the forward end of the said supporting rod serves to secure the frame thereon and against the collar 33.

Carried by and inserted through the upper end of the arm 15 is a suitable insulating bushing 36 through which passes a bindin post 37. Secured to the inner end of the sai binding post 37 is the substantially U-shapedstationary contact member 38 while secured to the outer end of the said binding post 37 is one end of the wire 39, the opposite end thereof being secured to the binding post 40 inserted through the insulating bushing 41 carried by and passing through the supporting plate 10 as will be clearly seen upon reference to figure 2 so that the binding post 40 is held from contact with the said plate 10.

Secured between the inner portion of the bushing 36 and the arm 15 is the angularly directed attaching car 42 of the indicating plate 43 which has marked thereon suitable graduations 44 to indicate different degrees of heat. Carried'by and passing through the upper end of the arm 16 of the frame is an insulating bushing 45 while secured to and passing through the said arm 16 beneath and in vertical alinement with the bushing 45 is a similar bushing) 46, and inserted through the bushing 46 is a inding post 47 to the outer end of which is secured one end of the wire 48, the opposite end thereof being secured to one end of the binding post 49, supported in the insulating bushing 50 carried by the said plate 10 beneath the bushing 40.

Secured to the bushing 46 is the substantially vertical contact plate 51, the upper end of which is bent outwardly and then downwardly with the terminal 52 thereof positioned opposite the bushing 45. Threaded through the contact plate 51, the terminal 52 thereof and the bushing 45 is an adjusting bolt or movable contact 53, the outer end thereof being provided with a suitable manipulating handle 54, while the inner end thereof is formed with a suitable point 55. Threaded on the bolt 53 adjacent the point 55 thereof are a pair of nuts 56 between which is clamped the pointer 57, adapted to register with the graduations 44 on the indicating plate 43.

Secured to the outer ends of the binding posts 40 and 49 are the wires 58 and 59- respectively which are adapted to lead to a suitable signal such as a bell, light .or enunciator as may be preferred. A

In the operation of the present invention, the alarm is first adjusted so that it will operate when the temperature in the room or other place where it is positioned, has reached a predetermined de ree and this is accomplished by rotating t e adjusting bolt 53 until the pointer 57 carried thereby registers with the desired graduation 44 on theplate 43.

As shown in Figure 1, the alarm is adjusted to operate when the temperature in the room or other place where it is positioned reaches ninety degrees and when the temperature reaches this point, the wafers 21 and 22 of the thermostat G will be expanded by the heat and as these wafers expand, the side sections 13 and 14 of the frame B will be swung about the pivot rod 12.

As the legs 17 and 18 are urged apart, the arms 15 and 16 will be moved towards each other and when the point 55 of the bolt or movable contact 53 engages with the stationary contact member 38, an electric circuit will be closed through an enunciator or other signal whereby to cause the operation of the same. The electric current will pass through the wire 58, and binding post 40 into and through the wire 39 and binding post 37 into the U-shaped stationary contact member 38. The current will then pass through the adjusting bolt 33, contact plate 51, binding post 47, wire 48, and binding post 49, into the wire 59 and back through the signal. It will be appreciated that the insulating bushings hereinabove described are so constructed as to prevent the binding posts carried thereby from contacting with the arms 15 and 16 and the supporting plate 10.

From the foregoing, it will be seen that there has been rovided a thermostatic fire alarm which Wlll accomplish all of the objects and perform all of the functions enumerated as being desirable in the state ment of the invention set forth above and it is to be understood that while, for the purpose of illustration, there has been disclosed one embodiment of the present invention which in practice will ive both eflicient and reliable results, that c anges in the details of construction thereof may be resorted to without departing from or sacrificing the spirit of the invention so long as such changes fall within the scope of the appended claims.

What is claimed is:

1. In a thermostatically operated device of the character described, a pair of spaced arm members, an electric contact point carried by one of said members, a screw member threaded transverselythrough the other of said members in alignment with said contact, means for connecting an electrical conductor with said contact and with said screw member, and a heat expanding member arranged between said\arms and connected to the same for moving said contact and screw member relative to one another, a plate member carried by one of said arms and designed to span the space therebetween, and a pointer member carried upon the forward end of said screw and shiftable with the adjusting of the same to co-act with certain indicia upon said plate,

, 2. A thermostatically cperated electric circuit her and breaker comprising a {pair of heat expanding element arranged between the lower ends of said arm and attached at each side to an adjacent arm, a scale plate carried by the upper end of one of the arm members to extend across the space between the arms, and a pointer member carried upon the forward end of said screw member for regulating the adjustment of the screw in ac- 20 cordance with the scale upon said plate.

In testimony whereof I aflix my signature.

COREL A. STILWELL. 

